|Publication number||US7780447 B2|
|Application number||US 11/406,626|
|Publication date||Aug 24, 2010|
|Filing date||Apr 19, 2006|
|Priority date||Jan 11, 2002|
|Also published as||CA2473087A1, CA2473087C, DE60327164D1, EP1467674A1, EP1467674B1, US20040033470, US20060188846, US20060194170, WO2003059189A1|
|Publication number||11406626, 406626, US 7780447 B2, US 7780447B2, US-B2-7780447, US7780447 B2, US7780447B2|
|Inventors||Peter S. Wöhrle, Duaine E. Griffith|
|Original Assignee||Nobel Biocare Services Ag|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (98), Non-Patent Citations (35), Classifications (14), Legal Events (1)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This application is a divisional of U.S. patent application Ser. No. 10/341,531, filed Jan. 13, 2003, now abandoned, which claims the priority benefit under 35 U.S.C. §119(e) of Provisional Application 60/347,723 filed Jan. 11, 2002, the entire contents of these applications are hereby incorporated by reference herein.
1. Field of the Invention
The present invention relates generally to dental implants and, more particularly, to an improved dental implant system.
2. Description of the Related Art
Implant dentistry involves the restoration of one or more teeth in a patient's mouth using artificial components. Such artificial components typically include a dental implant and a prosthetic tooth and/or a final abutment that is secured to the dental implant. Generally, the process for restoring a tooth is carried out in three stages.
Stage I involves implanting the dental implant into the alveolar bone (i.e., jawbone) of a patient. The oral surgeon first accesses the alveolar bone through the patient's gum tissue and removes any remains of the tooth to be replaced. Next, the specific site in the alveolar bone where the implant will be anchored is widened by drilling and/or reaming to accommodate the width of the dental implant to be implanted. Then, the dental implant is inserted into the hole, typically by screwing, although other techniques are known for introducing the implant in the jawbone.
After the implant is initially installed in the bone, a temporary healing cap is secured over the exposed proximal end in order to seal an internal bore of the implant. The patient's gums are then sutured over the implant to allow the implant site to heal and to allow desired osseointegration to occur. Complete osseointegration typically takes anywhere from four to ten months.
During stage II, the surgeon reaccesses the implant fixture by making an incision through the patient's gum tissues. The healing cap is then removed, exposing the proximal end of the implant. Typically, an impression coping is attached to the implant and a mold or impression is then taken of the patient's mouth to accurately record the position and orientation of the implant within the mouth. This is used to create a plaster model or analogue of the mouth and/or the implant site and provides the information needed to fabricate the prosthetic replacement tooth and any required intermediate prosthetic components. Stage II is typically completed by attaching to the implant a temporary healing abutment or other transmucosal component to control the healing and growth of the patient's gum tissue around the implant site. In a modified procedure, an abutment or other transmucosal component is either integrally formed with the implant or attached to the implant during stage I. In such a procedure, stages I and II are effectively combined in to a single stage.
Stage III involves fabricating and placement of a cosmetic tooth prosthesis to the implant fixture. The plaster analogue provides laboratory technicians with a model of the patient's mouth, including the orientation of the implant fixture and/or abutment relative to the surrounding teeth. Based on this model, the technician constructs a final restoration. The final step in the restorative process is replacing the temporary healing abutment with the final abutment and attaching a final prosethesis to the final abutment.
The dental implant is typically fabricated from pure titanium or a titanium alloy. The dental implant typically includes a body portion and a collar. The body portion is configured to extend into and osteointegrate with the alveolar bone. The top surface of the collar typically lies flush with the crest of the jawbone bone. The final abutment typically lies on the top surface and extends through the soft tissue, which lies above the alveolar bone. As mentioned above, the abutment supports the final prostheses. Typically, the coronal or crown portion of the collar and the portions of the final abutment that extend through the soft tissue have a machined or polished surfaces. This arrangement is believed in the art to prevent the accumulation of plaque and calculus and facilitates cleaning.
One aspect of the present invention includes the recognition that the body's natural defense mechanisms tend to provide approximately a 2-3 millimeter zone of soft tissue between the abutment-implant interface (i.e., microgap) and the alveolar crest. This zone is referred to as the “biological width” and is present around natural teeth as well as dental implants. The biological width typically extends 360 degrees around the implant and lies coronal to the alveolar crest and apical to the prosthetic crown margin (approximately 2.5-3 millimeters). The biological width consists of approximately 1 millimeter gingival sulcus, 1 millimeter epithelial attachment and 1 millimeter connective tissue attachment. In prior art implants, the abutment-implant interface typically lies flush with the alveolar crest. As such, the bone tissue is reabsorbed and the alveolar crest retreats until the proper biological width can be reestablished. This bone loss is undesirable both aesthetically and structurally.
Another aspect of the invention is the recognition that the prior art typically provides for a flat interface (i.e., microgap) between the abutment and the collar of the implant. However, due to the irregular configuration of the alveolar crest, a flat interface makes it difficult to conform to a proper biological width in all 360 degrees around the implant. A proper biological width that does not extend for all 360 degrees around the implant can produce undesirable bone loss.
Therefore, one embodiment of the present invention comprises a dental implant assembly for supporting a dental prosthesis. The assembly comprises a dental implant having a body portion located at a distal end of the dental implant. The body portion is configured to lie at least substantially below a crest of a patient's jawbone. A collar portion is located at a proximal end of the dental implant. The collar portion forms a top surface, which defines an outer edge that has at least one peak and valley to match the contours of a patient's soft tissue. A central bore extends through the collar portion and into the implant body portion. The central bore includes a threaded portion and a post portion. The assembly also includes an abutment comprising a post configured to fit within the post portion of implant. A final restoration is configured to fit over the upper portion of the abutment and has an implant mating surface that is configured to mate with the mating surface of the dental implant.
Another embodiment of the present invention comprises a dental implant assembly for supporting a dental prosthesis. The assembly comprises a dental implant having body portion located at a distal end of the dental implant. The body portion is configured to lie at least substantially below a crest of a patient's jawbone. A collar portion is located at a proximal end of the dental implant. The collar portion forms a mating surface which defines an outer edge that has a generally scalloped shape. A central bore extends through the collar portion and into the implant body portion. The central bore includes a threaded portion and a post portion. A healing abutment comprises a post configured to fit within the post portion of the central bore and including an upper portion and implant mating surface that is configured to mate with the mating surface of the dental implant.
Another embodiment of the present invention is dental implant assembly for supporting a dental prosthesis. The assembly comprises a dental implant and an insertion tool. The dental implant comprises a body portion located at a distal end of the dental implant. The body portion is configured to lie at least substantially below a crest of a patient's jawbone. The collar portion is located at a proximal end of the dental implant. The collar portion forming an abutment mating surface which defines an outer edge that has at least one peak and one valley. A central bore extends through the collar portion and into the implant body portion. The central bore includes a threaded portion and a post portion. The insertion tool comprises a post configured to fit within the post portion of the central bore and at least one depth marker for indicating the position of the outer edge. The assembly also comprises complementary mating surfaces between the post of the insertion tool and the post portion of the central tool. The complementary mating surfaces are configured to prevent relative rotation between the dental implant and the insertion tool.
For purposes of summarizing the invention and the advantages achieved over the prior art, certain objects and advantages of the invention have been described herein above. Of course, it is to be understood that not necessarily all such objects or advantages may be achieved in accordance with any particular embodiment of the invention. Thus, for example, those skilled in the art will recognize that the invention may be embodied or carried out in a manner that achieves or optimizes one advantage or group of advantages as taught herein without necessarily achieving other objects or advantages as may be taught or suggested herein.
All of these embodiments are intended to be within the scope of the invention herein disclosed. These and other embodiments of the present invention will become readily apparent to those skilled in the art from the following detailed description of the preferred embodiments having reference to the attached figures, the invention not being limited to any particular preferred embodiment(s) disclosed.
These and other features of this invention will now be described with reference to the drawings of a preferred embodiment which is intended to illustrate and not to limit the invention. The drawings contain the following figures:
As best seen in
The collar 16 preferably lies above (i.e., proximal) the lower portion 12 and in the illustrated embodiment is preferably integrally formed with or permanently affixed to the lower portion 12 at a collar/implant interface 22 (see
As best seen in
In one embodiment, the outer edge 28 is configured so as to be positioned at approximately the same height as the top surfaces of the naturally occurring soft-tissue morphology. In such embodiments, the peaks 30 of the outer edge 28 lie approximately 2-5 millimeters above the collar/body interface 22 while the valleys 32 lie approximately 1-5 millimeters below the peaks 30. In one preferred arrangement, the peak 30 lies approximately 4 millimeters above the collar body interface 25 and the valleys 32 lie approximately 2 millimeters below the peak. Although not illustrated it should be appreciated that in modified embodiments the peaks and valleys may have different heights. That is, the two peaks may have different heights as compared to each other. In a similar manner, the two valleys may have different heights as compared to each other.
As best seen in
With reference to
In the illustrated arrangement, the valleys 38 of the top edge 34 lie slightly above or at the collar/implant interface 22. The peaks 36 may lie approximately 1-5 millimeters above the valleys 38. In one embodiment, the peaks 36 lie approximately 2 millimeters above the valleys 38. As with the outer edge 28, it should be appreciated that in modified embodiments the peaks 36 and valleys 38 may have different heights. That is, the two peaks 36 may have different heights as compared to each other. In a similar manner, the two valleys 38 may have different heights as compared to each other.
The surface 35 of the collar 16 above the top edge may be polished to reduce accumulation of plaque and calculus. In a modified embodiment, the surface 35 may be treated to promote soft-tissue attachment. Such treatments may include roughening and the application of coatings that increase surface area.
With reference to
As best seen in
Turning now to
With reference back to
The embodiments described above have several advantages. For example, the illustrated implant 10 has a bone apposition surface 20 that follows the naturally occurring contours of the a patient's bone-tissue morphology. This arrangement reduces alveolar bone loss. In a similar manner, the interface between the final restoration 66 and the dental implant 10 follows the naturally occurring contours of the patient's soft-tissue morphology. This arrangement encourages uniform tissue growth above the bone tissue and minimizes the amount of the dental implant 10 that extends above the soft-tissue. In contrast, in prior art implants, substantial portions of the dental implant extend above the soft-tissue, which can create undesirable “shadows” in the gum-tissue. In addition, the interaction between top surface 26 of the implant and the lower surface 68 of the final restoration 66, provides an additional anti-rotational structure between the final restoration 66 and the implant 10.
The healing cap 74 includes a post 76 that is configured to fit within the post receiving section 44 of the dental implant 10. The healing cap 74 preferably includes a central bore 78 with a shoulder 80. The central bore 78 and shoulder 80 are configured to receive a bolt such as the bolt 100 described above. The bolt 100 can extend into the threaded section 42 to secure the healing cap 74 to the dental implant 10.
The healing cap 74 preferably includes a lower surface 82 (see
In the illustrated embodiment, the post 76 includes a releasable retention feature 90, which is configured to releaseably engage the central bore 40 of the dental implant 10. The post 76 may include a variety of releasable retention features, such as, for example, prongs or compressible material, for creating a releasable retention force between the dental implant 10 and the healing abutment. In the illustrated embodiment, the releasable retention feature 90 comprises a resilient O-ring 90 (shown in cross-section in
The insertion tool 110 includes a torque receiving member 114. The torque receiving member 114 is configured to transmit torque from a torque tool (e.g., a wrench) to the insertion tool. In this manner, the torque generated by the tool can be transmitted to the implant 10 through the insertion tool 110. In the illustrated embodiment, the torque receiving member 114 has a hexagonal cross-section. It should be appreciated that the torque receiving member 114 can be formed into a wide variety of other suitable shapes that may be used with efficacy, giving due consideration to the goals of providing anti-rotation between the torque tool and the insertion tool. For example, the torque receiving member 114 may comprise one or more radially inwardly or outwardly extending splines or recesses, flats, polygonal configurations and other anti-rotation complementary surface structures.
The illustrated insertion tool 110 also includes a handpiece receiving portion 116 is sized and dimensioned to fit within a commercial handpiece drill. Typically, the handpiece receiving portion 116 will include a D-shaped key 118 as depicted in
The insertion tool 110 includes a plurality of depth markers 120. In the illustrated embodiment, the depth markers 120 comprise annular grooves. In other embodiments, the depth markers 120 may be formed in a variety of other ways, such as, for example, laser etching, paint, protrusions, etc. The depth markers 120 may be used to guide the dental practitioner when inserting a dental implant into the patient's jawbone. For example, the depth makers 120 are preferably uniformly spaced and arranged so as to indicate the distance from the top of the implant to the top of the gum tissue. In this manner, the thickness of the gum tissue can be determined without requiring incisions to be made around the adjoining/adjacent tissue so as to raise a tissue flap for depth reference. Instead, a probe may be used along the insertion tool 110 to determine the position of the alveolar crest. In such an arrangement, the thickness of the gum tissue may be determined by reference to the depth markers 120 and the implant 10 can be appropriately positioned with respect to the alveolar crest and the top of the gum tissue.
As with the abutment 74, the post 112 of the insertion tool 110 preferably includes a releasable retention feature 122, which is configured to releaseably engage the central bore 40 of the dental implant 10. The post 112 may include a variety of releasable retention features, such as, for example, prongs or compressible material, for creating a releasable retention force between the dental implant 10 and the insertion tool 110. In the illustrated embodiment, the releasable retention feature 122 comprises a resilient O-ring 122 (shown in cross-section in
Although this invention has been disclosed in the context of certain preferred embodiments and examples, it will be understood by those skilled in the art that the present invention extends beyond the specifically disclosed embodiments to other alternative embodiments and/or uses of the invention and obvious modifications and equivalents thereof. In addition, while a number of variations of the invention have been shown and described in detail, other modifications, which are within the scope of this invention, will be readily apparent to those of skill in the art based upon this disclosure. It is also contemplated that various combination or subcombinations of the specific features and aspects of the embodiments may be made and still fall within the scope of the invention. Accordingly, it should be understood that various features and aspects of the disclosed embodiments can be combine with or substituted for one another in order to form varying modes of the disclosed invention. Thus, it is intended that the scope of the present invention herein disclosed should not be limited by the particular disclosed embodiments described above, but should be determined only by a fair reading of the claims that follow.
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|Cooperative Classification||A61C8/0069, A61C8/0018, A61C8/0077, A61C8/0054, A61C8/0066, A61C8/006, A61C8/005, A61C8/0089, A61C8/008|
|European Classification||A61C8/00G1P, A61C8/00G1, A61C8/00F|